EP0413123A1 - Method of transmitting data over an optical star network, and station and optical star network operating according to the same - Google Patents
Method of transmitting data over an optical star network, and station and optical star network operating according to the same Download PDFInfo
- Publication number
- EP0413123A1 EP0413123A1 EP90112834A EP90112834A EP0413123A1 EP 0413123 A1 EP0413123 A1 EP 0413123A1 EP 90112834 A EP90112834 A EP 90112834A EP 90112834 A EP90112834 A EP 90112834A EP 0413123 A1 EP0413123 A1 EP 0413123A1
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- EP
- European Patent Office
- Prior art keywords
- star
- network according
- information
- station
- stations
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/44—Star or tree networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/64—Hybrid switching systems
Definitions
- the present invention relates to a UCOL-type star network for the optimal management of various kinds of traffic according to the preamble of claim 1.
- UCOL network is configured as a passive star where each station is connected with its star center via two dedicated optical fibres.One fibre serves for transmission from the station to the star center and the other one for reception.
- Each optical fibre is assimilable to a multiple transmission channel.
- optical fibre link using the coherent optics technology allows that different channels be multiplexed through frequency division and used for several transmissions along the same fibre, thus optimizing the link resources.
- the present access protocols do not fit with a UCOL network.
- the access protocol systems using the priority concept are already available,at the present state of the art they appear to be intrinsecally very complicated as to frame structure.For such reason they cannot satisfy the functional characteristics of a UCOL network and cannot optimize the resources therein con tained.
- the object of the present invention is to eliminate the drawbacks of the prior art and to provide a UCOL network able to meet all the mentioned requirements by using new access protocol features which allow to solve the access dispute to the resources of a type UCOL network and to optimize the network resources,as well as to be able to transmit simultaneously,along the same channel and through cell transmission, both synchronous and packet traffic.
- such a network can operate both with synchronous and asynchronous traffic, by using the same channel (reference is made to packet and synchronous traffic as an example).
- the ideal situation for a UCOL network is the one in which there is a continuous data flow, controlled by the access protocol from the stations 7,8,9,10...N to the star-center 6 without these data packets colliding each other thus generating an unintelligibility of their contents.
- the access protocol accordinging to the present invention,provides for the subdivision of each channel 1 into frames 2.
- an optimal repetition time of each single frame,fixed in one millisecond,i.e. each frame repeats at each millisecond in the transmission channel, is established.
- the frame 2, according such an access protocol, is then shared out,in this istance,into three parts. More particularly, into a first part 3 individuating basically an information related to frame beginning; into a part 4 characterizing essentially an information about the status of data access queues from the various stations; as well as into a part 5 related to data informative contents from the various stations.
- the part 3 of the beginning of frame comprises 48 bytes and is subdivided in two sections 3a and 3b.
- the section 3a contains the information related to frame beginning.
- the section 3 contains a field called GUARD TIME related to a time approximately evaluated as 50 nanoseconds which provides for measurement errors related to a time information concerning the measurement of distance between a station and the star center 6,of which an exhaustive explanation will be given hereinafter,in order to avoid colli sion among the data blocks.
- a first section 4a relative to the synchronization of data flow from the stations, which acts for discriminating several blocks transmitting in synchronism
- a section 4b called MGT (MANAGEMENT)
- MANAGEMENT a section whose information acts for providing new communication channels for distributed networks upon new requests from management of the network itself.
- sections 4c, 4d, 4e, 4f, 4g which, indicated in figure by P0 to P4, represent five priority classes related to access priority for data coming from the stations to the star center, used for selecting data access of a station with respect to the others, as a function of transmission priority, i.e. of wait time. All this to conform the synchronous traffic treatment modes to the packet traffic treatment mode, but considering that the synchronous traffic has a higher priority with respect to packet traffic.All the above mentioned traffics are thus managed by informations related to corresponding priority classes.
- the higher priority class is that one having the lower number,i.e. class 0 represents the highest priority. Morevoer, class 0 is exclusively reserved for synchronous traffic,while the other ones are reserved for further priorities.
- Each priority class has two bytes for quantizing the priority intrinsic value and which in any case represents, as priority class, a number proportional to the maximum time the information transmitted by a station, meant as data quantity, must wait before its transmission. Normally, this time decreases as the wait time increases and, when it reaches the maximum priority and is not transmitted, the packet is abandoned.
- Each of the 64 subparts of part 4, configured as hereinbefore described, contains totally 28 bytes.
- the part 5 related to informations is also structured in various sections: one,5a,for synchronism,as said in section 4a, another one containing an information characterizing both the source and the destination of the informative contents and the information beginning, and is indicated by 5b,and,in the end, there is the cell information,indicated by 5c, still closed by GUARD TIME field 5d.
- the whole part 5 can contain 200 subparts, each structured in the same manner as part 5, from 5a to 5d, just illustrated and provided with 88 bytes for each of 200 subparts.
- 16 bytes are used for synchronization, 3 bytes for identifying the terminal station and for having a spare for eventual applications not foreseen and, of the remaining bytes, 64 are used for the real information, also in conformity with the rules nowadays in use, and five for providing a further beginning of real intrinsic informative part.
- each station sends initially an own signal toward the star center,waiting its return.
- the initialization time information which value corresponds with the distance of the station from the star center.
- said time information characterizes an advance time for the transmission of data informative contents, which time begins when allowed by the synchronism information and the priority class and lasts for a period corresponding exactly to propagation delay of the information along the link optical channel and depends on the effective measured distance between the station and the star center.
- the bytes present in the various sections of the various parts 3,4,5 provide a data set which,travelling along channel 1, allow to avoid collisions among data coming from the various stations,optimize the channel sharing trough the one millisecond time, and allow to provide an information on the status of accesses through queues status 4.
- cell transmissions can also be sent, as just mentioned, both in case of synchronous traffic and packet traffic.
- Such a protocol structure for network access can be easily implemented because it can be subdivided into further frame shares without any difficulty.
- the frame structure is particularly simple and does not imply any complication neither of bytes or further subparts burden.
- the basic concepts of the network subject of the present invention can be summarized,on the one hand, in the initialization of stations according to their distance from the star center and,on the other hand, in the frame sharing into three parts 3,4,5, which provide together a plurality of characteristic informations,the access queues status, as well as the possibility of cell transmission, which make such type of protocol specific for UCOL networks.
- Such networks have the particular star topology, as well as particular technical aspects such as distance and station number parameters, and the aforementioned services such as, inter alia, the possibility of managing simultaneously, on the same channel, both the synchronous traffic and the packet traffic.
- the number of usable optical channels has been fixed equal to 24.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Small-Scale Networks (AREA)
- Optical Communication System (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
- Ceramic Products (AREA)
- Power Steering Mechanism (AREA)
- Casting Devices For Molds (AREA)
- Traffic Control Systems (AREA)
- Road Signs Or Road Markings (AREA)
Abstract
Description
- The present invention relates to a UCOL-type star network for the optimal management of various kinds of traffic according to the preamble of
claim 1. - As it is known,in the communications management in a network,where there are several transmitting stations,it is important to determine the access priorities of each station to the network itself,and then to the resources thereof,so as to avoid collision between the informative packets generated by the various stations.
- Relatively to UCOL networks, such a problem is particularly prominent due to their particular characteristics concerning topology, technical features and types of offered services.
- Indeed,a UCOL network is configured as a passive star where each station is connected with its star center via two dedicated optical fibres.One fibre serves for transmission from the station to the star center and the other one for reception.
- Each optical fibre is assimilable to a multiple transmission channel.
- The particular kind of optical fibre link using the coherent optics technology,allows that different channels be multiplexed through frequency division and used for several transmissions along the same fibre, thus optimizing the link resources.
- As concerns the management of the access of each station to the network,the present access protocols do not fit with a UCOL network.Moreover,although the access protocol systems using the priority concept are already available,at the present state of the art they appear to be intrinsecally very complicated as to frame structure.For such reason they cannot satisfy the functional characteristics of a UCOL network and cannot optimize the resources therein con tained.
- This is due to the fact that the trend of the ideal management of access disputes to network resources, during the transmission of the various data coming from the various stations, is not well defined in the prior art.
- Therefore,the object of the present invention is to eliminate the drawbacks of the prior art and to provide a UCOL network able to meet all the mentioned requirements by using new access protocol features which allow to solve the access dispute to the resources of a type UCOL network and to optimize the network resources,as well as to be able to transmit simultaneously,along the same channel and through cell transmission, both synchronous and packet traffic.
- This object is achieved by the features set forth in the
claim 1,whereas further details and improvements are evidenced in the subclaims. - From an operative point of view, such a network can operate both with synchronous and asynchronous traffic, by using the same channel (reference is made to packet and synchronous traffic as an example).
- Moreover, with such a network it is possible to avoid the collision between data flows, being able to provide for the errors due to information on the measurement of distance between the station and the star center,and it is possible to prepare the informations for transmission, knowing a transmission advance time which depends on the information propagation delay along the optical channel in addition to the measured distance between the station and the star-center.
- Finally with such a network it is possible to classify, thanks to priority classes, the kind of traffic to be managed.
- The invention will now be described in detail next herein, by way of an example, with reference to the attached drawings, wherein:
- -in Fig.1 a UCOL network is schematically illustrated; and
- -in Fig.2 there is illustrated the frame structure of the access protocol of the UCOL transmission network, according to the present invention.
- First of all it is a good thing to state beforehand that generally a UCOL network is to be considered as a multichannel network,thereby the access protocol described hereinafter is referred only to one channel,but what has been stated can be implemented on all others.
- The ideal situation for a UCOL network is the one in which there is a continuous data flow, controlled by the access protocol from the
stations center 6 without these data packets colliding each other thus generating an unintelligibility of their contents. - The access protocol,according to the present invention,provides for the subdivision of each
channel 1 intoframes 2. - First of all, an optimal repetition time of each single frame,fixed in one millisecond,i.e. each frame repeats at each millisecond in the transmission channel, is established. The
frame 2, according such an access protocol, is then shared out,in this istance,into three parts. More particularly, into afirst part 3 individuating basically an information related to frame beginning; into a part 4 characterizing essentially an information about the status of data access queues from the various stations; as well as into a part 5 related to data informative contents from the various stations. - Each of these parts is, in turn, subdivided into sections having a well defined quantity of bytes.
- The
part 3 of the beginning of frame,specifically, comprises 48 bytes and is subdivided in twosections 3a and 3b. The section 3a contains the information related to frame beginning.Thesection 3 contains a field called GUARD TIME related to a time approximately evaluated as 50 nanoseconds which provides for measurement errors related to a time information concerning the measurement of distance between a station and thestar center 6,of which an exhaustive explanation will be given hereinafter,in order to avoid colli sion among the data blocks. - In part 4 of
frame 2,related to queues status, are a first section 4a,relative to the synchronization of data flow from the stations, which acts for discriminating several blocks transmitting in synchronism; asection 4b, called MGT (MANAGEMENT), which is an additional section whose information acts for providing new communication channels for distributed networks upon new requests from management of the network itself. - In part 4 are then five more sections 4c, 4d, 4e, 4f, 4g, which, indicated in figure by P0 to P4, represent five priority classes related to access priority for data coming from the stations to the star center, used for selecting data access of a station with respect to the others, as a function of transmission priority, i.e. of wait time. All this to conform the synchronous traffic treatment modes to the packet traffic treatment mode, but considering that the synchronous traffic has a higher priority with respect to packet traffic.All the above mentioned traffics are thus managed by informations related to corresponding priority classes.
- Normally, the higher priority class is that one having the lower number,i.e. class 0 represents the highest priority. Morevoer, class 0 is exclusively reserved for synchronous traffic,while the other ones are reserved for further priorities. Each priority class has two bytes for quantizing the priority intrinsic value and which in any case represents, as priority class, a number proportional to the maximum time the information transmitted by a station, meant as data quantity, must wait before its transmission. Normally, this time decreases as the wait time increases and, when it reaches the maximum priority and is not transmitted, the packet is abandoned.
- In part 4 according to access queues status in the frame, it is decided which of the packets must be transmitted with the subsequent frame.
- Now ,since in the present case the maximun foreseen number of stations is better to be 64, in such part there are 64 subparts, each structured as part 4 just described from 4a to 4h.
- Also in part 4,at the end of the five priority classes,there is a GUARD TIME field, in that case indicated by 4h,having the same purposes of the previous one, namely 3b.
- Each of the 64 subparts of part 4, configured as hereinbefore described, contains totally 28 bytes.
- For the synchronization,16 bytes are needed,while for
section - Finally,the part 5 related to informations is also structured in various sections: one,5a,for synchronism,as said in section 4a, another one containing an information characterizing both the source and the destination of the informative contents and the information beginning, and is indicated by 5b,and,in the end, there is the cell information,indicated by 5c, still closed by GUARD
TIME field 5d. The whole part 5 can contain 200 subparts, each structured in the same manner as part 5, from 5a to 5d, just illustrated and provided with 88 bytes for each of 200 subparts. - Of these 88, 16 bytes are used for synchronization, 3 bytes for identifying the terminal station and for having a spare for eventual applications not foreseen and, of the remaining bytes, 64 are used for the real information, also in conformity with the rules nowadays in use, and five for providing a further beginning of real intrinsic informative part.
- Obviously, several informations pertaining to more than one of such 200 subparts, can be grouped together so as to provide a single informative concept.
- After each frame has been prepared and after each station is enabled to send its informations, the entire network will have its map of informative cells wherein each station will have priorities characterized by priority classes 4c to 4g.
- All this occurs upon initialization of each station with an own time information depending upon its distance from the star center.
- Indeeed,each station sends initially an own signal toward the star center,waiting its return. In this way it is possible for each station to get the initialization time information, which value corresponds with the distance of the station from the star center. In substance, said time information characterizes an advance time for the transmission of data informative contents, which time begins when allowed by the synchronism information and the priority class and lasts for a period corresponding exactly to propagation delay of the information along the link optical channel and depends on the effective measured distance between the station and the star center.
- The bytes present in the various sections of the
various parts 3,4,5 provide a data set which,travelling alongchannel 1, allow to avoid collisions among data coming from the various stations,optimize the channel sharing trough the one millisecond time, and allow to provide an information on the status of accesses through queues status 4. - Moreover, cell transmissions can also be sent, as just mentioned, both in case of synchronous traffic and packet traffic.
- Such a protocol structure for network access can be easily implemented because it can be subdivided into further frame shares without any difficulty.Besides, the frame structure is particularly simple and does not imply any complication neither of bytes or further subparts burden.
- The basic concepts of the network subject of the present invention can be summarized,on the one hand, in the initialization of stations according to their distance from the star center and,on the other hand, in the frame sharing into three
parts 3,4,5, which provide together a plurality of characteristic informations,the access queues status, as well as the possibility of cell transmission, which make such type of protocol specific for UCOL networks. Indeed, such networks have the particular star topology, as well as particular technical aspects such as distance and station number parameters, and the aforementioned services such as, inter alia, the possibility of managing simultaneously, on the same channel, both the synchronous traffic and the packet traffic. - Relatively to the UCOL network described in the present invention, the number of usable optical channels has been fixed equal to 24.
- It must be specified that the maximum number of stations linkable to the star center via optical channels should never exceed thirty kilometers, since such parameters should largely influence the network performances.
- Obviously, other improvements and developments are also possible, all falling within the inventive sphere of the present invention.
Claims (12)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2111289 | 1989-07-06 | ||
IT8921112A IT1230301B (en) | 1989-07-06 | 1989-07-06 | STAR TRANSMISSION NETWORK, UCOL TYPE, FOR THE OPTIMAL MANAGEMENT OF DIFFERENT TYPES OF TRAFFIC. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0413123A1 true EP0413123A1 (en) | 1991-02-20 |
EP0413123B1 EP0413123B1 (en) | 1995-01-18 |
Family
ID=11176923
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90112834A Expired - Lifetime EP0413123B1 (en) | 1989-07-06 | 1990-07-05 | Method of transmitting data over an optical star network, and station and optical star network operating according to the same |
Country Status (9)
Country | Link |
---|---|
US (1) | US5172374A (en) |
EP (1) | EP0413123B1 (en) |
JP (1) | JP2758068B2 (en) |
AT (1) | ATE117488T1 (en) |
DE (1) | DE69016126T2 (en) |
ES (1) | ES2070217T3 (en) |
FI (1) | FI102339B (en) |
GR (1) | GR3014921T3 (en) |
IT (1) | IT1230301B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0506214A1 (en) * | 1991-03-27 | 1992-09-30 | Siemens Aktiengesellschaft | Method for operating a multiplex-control for an on-board network for automotive-vehicle |
US5483532A (en) * | 1991-07-04 | 1996-01-09 | Telefonaktiebolaget Lm Ericsson | Method of packeting continuous data information and packet data in frames |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5570364A (en) * | 1994-04-14 | 1996-10-29 | Lucent Technologies Inc. | Control for multimedia communication on local access table |
JP3262453B2 (en) * | 1994-05-13 | 2002-03-04 | キヤノン株式会社 | Information sharing method, line allocation method, and communication system using the same |
DE19511332A1 (en) * | 1995-03-28 | 1996-10-02 | Sel Alcatel Ag | Broadband distribution system and method therefor |
US5680394A (en) * | 1995-07-11 | 1997-10-21 | Amati Communications Corporation | Time division duplexed high speed data transmission system and method |
JP3832860B2 (en) * | 1996-09-07 | 2006-10-11 | バイエリッシェ モートーレン ウエルケ アクチエンゲゼルシャフト | Data bus for multiple bus sharing devices |
US6904057B2 (en) | 2001-05-04 | 2005-06-07 | Slt Logic Llc | Method and apparatus for providing multi-protocol, multi-stage, real-time frame classification |
US6901052B2 (en) | 2001-05-04 | 2005-05-31 | Slt Logic Llc | System and method for policing multiple data flows and multi-protocol data flows |
EP1953959A1 (en) * | 2007-02-01 | 2008-08-06 | British Telecommunications Public Limited Company | Data communication |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0255442A2 (en) * | 1986-07-30 | 1988-02-03 | ALCATEL ITALIA S.p.A. | Circuit device for implementing the access protocol for serial exchange of numerical informations among terminals interconnected by an optical fiber star network |
-
1989
- 1989-07-06 IT IT8921112A patent/IT1230301B/en active
-
1990
- 1990-07-05 AT AT90112834T patent/ATE117488T1/en not_active IP Right Cessation
- 1990-07-05 EP EP90112834A patent/EP0413123B1/en not_active Expired - Lifetime
- 1990-07-05 ES ES90112834T patent/ES2070217T3/en not_active Expired - Lifetime
- 1990-07-05 DE DE69016126T patent/DE69016126T2/en not_active Expired - Fee Related
- 1990-07-05 FI FI903400A patent/FI102339B/en not_active IP Right Cessation
- 1990-07-06 US US07/549,371 patent/US5172374A/en not_active Expired - Fee Related
- 1990-07-06 JP JP2177620A patent/JP2758068B2/en not_active Expired - Lifetime
-
1995
- 1995-02-01 GR GR950400185T patent/GR3014921T3/en unknown
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0255442A2 (en) * | 1986-07-30 | 1988-02-03 | ALCATEL ITALIA S.p.A. | Circuit device for implementing the access protocol for serial exchange of numerical informations among terminals interconnected by an optical fiber star network |
Non-Patent Citations (1)
Title |
---|
Ninth International Conference on Computer Communication October 1988, NORTH HOLLAND-AMSTERDAM (NL) pages 373 - 378; S.TREVES: "BROADBAND LOCAL AND METROPOLITAN AREA NETWORKS IN AN IBCN ENVIRONMENT" * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0506214A1 (en) * | 1991-03-27 | 1992-09-30 | Siemens Aktiengesellschaft | Method for operating a multiplex-control for an on-board network for automotive-vehicle |
US5483532A (en) * | 1991-07-04 | 1996-01-09 | Telefonaktiebolaget Lm Ericsson | Method of packeting continuous data information and packet data in frames |
Also Published As
Publication number | Publication date |
---|---|
ATE117488T1 (en) | 1995-02-15 |
JP2758068B2 (en) | 1998-05-25 |
ES2070217T3 (en) | 1995-06-01 |
FI102339B1 (en) | 1998-11-13 |
IT1230301B (en) | 1991-10-18 |
FI903400A0 (en) | 1990-07-05 |
JPH0345044A (en) | 1991-02-26 |
DE69016126T2 (en) | 1995-06-08 |
FI102339B (en) | 1998-11-13 |
GR3014921T3 (en) | 1995-05-31 |
EP0413123B1 (en) | 1995-01-18 |
US5172374A (en) | 1992-12-15 |
IT8921112A0 (en) | 1989-07-06 |
DE69016126D1 (en) | 1995-03-02 |
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